https://doi.org/10.1140/epja/s10050-023-01033-4
Regular Article - Theoretical Physics
Vector meson-nucleon scattering length 
and trace anomalous energy contribution to the nucleon mass 
1
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
2
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, 100049, Beijing, China
3
Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, 510006, Guangzhou, China
Received:
1
February
2023
Accepted:
12
May
2023
Published online:
27
May
2023
The interaction of vector meson with nucleon, vector meson-nucleon scattering length , is an important component of the study of hadronic interactions. Nowadays many scattering length values have been reported using the recent photoproduction experiment data or quasidata. In addition, the study of trace anomalous energy contribution to the proton mass is also a hot topic in non-perturbative QCD and hadron physics. In this work, we established the relationship between the scattering length of the vector meson-proton 
and the trace anomaly contribution of the proton mass . With the scattering length values extracted by using the Vector Meson Dominance model, we obtained the trace anomaly contribution of the proton mass = (19.0
± 0.8), which is of similar order of magnitude as the 23 given by Lattice QCD calculation.
Chengdong Han and Wei Kou: contributed equally.
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